This vulnerability exists due to improper sanitization of parameters supplied via URL. An unauthenticated, remote attacker could exploit the vulnerability by convincing the user to view a malicious link. If successful, the attacker could conduct a cross-site scripting attack and capture sensitive browser-based information.

Microsoft has confirmed the vulnerability in a security bulletin and released software updates.

To exploit the vulnerability, an attacker must convince a targeted user to open a malicious link. Attackers may provide links to users within e-mail or instant messages and use social engineering techniques to make a user more interested in following the link. If successful, the attacker could take actions as the user or gain access to sensitive browser-based information, including authentication credentials or recently-submitted data.

Microsoft has released a security bulletin at the following link: MS10-089

Impact

An unauthenticated, remote attacker could exploit this vulnerability to conduct a cross-site scripting attack, allowing the attacker to execute arbitrary script or HTML code in the user's browser in the security context of the affected site. An exploit could allow the attacker to take actions on the site as the targeted user or gain access to sensitive browser-based information.

Technical Information

This vulnerability exists due to improper sanitization of parameters supplied via URL to the Forefront Unified Access Gateway (UAG) Mobile Portal Website component before returning the parameters to the user.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a targeted user to follow a link that is designed to send malicious input to the targeted application. When followed, the link may cause the application to return the malicious input to the user's browser. As a result, the attacker could execute arbitrary script or HTML code in the user's browser in the security context of the affected application.

Safeguards

Administrators are advised to apply the appropriate software updates.

Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.

Administrators are advised to monitor critical systems.

Patches/Software

Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Windows Update website. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.

The security vulnerability applies to the following combinations of products.

Primary Products:

Microsoft, Inc.

Forefront Unified Access Gateway

2010 Base, Update 1, Update 2

Associated Products:

N/A

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